Model Code Definition

D663 = D660 core series, NG10 ISO4401-05 installation dimension, ServoJet jet-pipe pilot structure, built-in amplifier + full-travel LVDT spool closed-loop feedback architecture

Z = Factory custom revision for non-standard flow gain and preset zero offset calibration

4322 = Fixed trim code defining rated flow, amplifier gain and factory pre-set null point, four-way spring-centered spool with 10% positive overlap flow characteristic

K = Upgrade configuration: high-temperature fluorocarbon sealing, anti-vibration internal amplifier layout, split independent T/Y drain design for high thermal stability

Technical Specifications

Hydraulic Parameters

Rated Flow:268 L/min @35bar single-side differential pressure; peak instantaneous flow 395 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main ports up to 350bar; internal T drain ≤210bar; standalone external Y drain tolerates full 350bar system pressure

Full Stroke Step Response:≤26.8ms under standard 210bar supply hydraulic pressure

Control Precision:Hysteresis＜0.23%FS, Resolution＜0.075%FS, total thermal drift(-20~+80℃)＜2.2%FS

Null Leakage:0.36~1.98 L/min caused by 10% positive overlap spool structure

Working Medium:Anti-wear mineral hydraulic oil, fluid cleanliness NAS6~7 / ISO4406 17/14/11, permissible fluid temperature -20℃~+80℃

Net Weight:3.58kgMoog Inc.

Electrical Parameters

Input Power Supply:24VDC wide input range(18~32VDC), static standby operating current ≤795mA

Standard Control Command:Factory preset ±10VDC differential voltage input; ±10mA /4~20mA current signal available via factory recalibration

EMC Compliance:Complies with EN55011 industrial EMC standard; standard 7-pin military circular connector with IP65 protection after complete cable assemblyMoog Inc.

Port & Connection Configuration

Hydraulic Interface:ISO4401-05 NG10 standard hole layout with independent P supply port, A/B actuator control ports, separated internal T drain and dedicated external Y drain, factory preassembled fluorocarbon composite mounting gaskets matching K suffix high temp specification

Electrical Interface:7-pin circular receptacle integrates 24V power supply, ±10VDC control command and full-stroke LVDT spool feedback signal; double-shielded control cable required with single-point cabinet grounding, no digital fieldbus communication interface

Core Functions

1.Patented ServoJet jet-pipe pilot provides superior contamination resistance vs conventional nozzle-flapper pilot, ensuring stable continuous operation under moderately contaminated hydraulic fluid condition.

2.10% positive overlap main spool delivers stable medium-flow pressure/force closed-loop regulation; onboard LVDT closed-loop dynamically compensates spool displacement drift induced by wide-range temperature fluctuation, K option further restrains long-term zero drift during uninterrupted heavy-load running.

3.Spring-centered fail-safe neutral design: main spool automatically returns to center upon power loss to block A/B oil paths and lock hydraulic cylinder for overload safety protection.

4.Factory fixed amplifier gain optimized for medium-flow heavy-duty working condition; ±10VDC analog input features excellent anti-interference for medium-long wiring precision closed-loop control.

Typical Application

Medium-tonnage hydraulic forging press master cylinder force closed-loop control, metallurgical hot rolling mill hydraulic cylinder positioning control, multi-spec medium-load material fatigue test bench hydraulic drive, medium-size die-casting equipment clamping & injection precision control, aerospace component hot-forming hydraulic servo control system.

Installation & Maintenance Instructions

1.Install 3μm high-pressure inline precision filter on upstream supply pipeline; replace original filter cartridge after 15 working days of equipment commissioning startup.

2.Arrange power cable and shielded control wire in separate wiring troughs to avoid inverter harmonic interference to analog signal; fasten valve with standard flat washers following factory specified tightening torque during installation.

3.Flow gain and null offset parameters are fully pre-calibrated at MOOG factory; only tiny on-site potentiometer fine adjustment allowed; complete disassembly of ServoJet pilot and main spool assembly is strictly forbidden.

4.Seal unused hydraulic ports with original factory blank plugs for spare stock; store inside dry dustproof warehouse to prevent composite seal ageing and hydraulic oil leakage.